TiO_2纳米管石墨烯凝胶吸附酸性大红热力学研究
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摘要
以二氧化钛纳米管与氧化石墨烯为原料,借助超声波手段和水热合成法,通过原位自组装,得到纳米二氧化钛(NTs)石墨烯复合水凝胶,简称H-NTs-GO。研究H-NTs-GO对酸性大红吸附过程,考察了反应温度对吸附效果的影响,结果表明:吸附等温线符合Freundlich方程,升高温度可以提高吸附容量;分析了酸性大红在H-NTs-GO上的吸附热力学行为,热力学参数ΔG为负值、ΔH和ΔS为正值,说明吸附是一个自发吸热过程,吸附过程是一个熵增加的过程,吸附过程中混乱度在增加。
Grapheme oxide composite hydrogels with NTs,whose abbreviation was H-NTs-GO,were prepared with in-situ self-assembly by means of ultrasonic and hydrothermal synthesis method. The adsorption process of acid brilliant scarlet on H-NTs-GO was studied. The effect of temperature on adsorption capacity was investigated. The experimental results showed that the data could be described by Freundlich model with the higher regression coefficient,besides the adsorption capacity was enhanced with the increase of temperature. The thermodynamic parameters of adsorption reaction,ΔG < 0,ΔH >0 and ΔS > 0,indicated that adsorption process was a spontaneously endothermic reaction. Besides the values of entropy increased during the whole adsorption process,which indicated that the degree of chaos was increasing during the adsorption.
Grapheme oxide composite hydrogels with NTs,whose abbreviation was H-NTs-GO,were prepared with in-situ self-assembly by means of ultrasonic and hydrothermal synthesis method. The adsorption process of acid brilliant scarlet on H-NTs-GO was studied. The effect of temperature on adsorption capacity was investigated. The experimental results showed that the data could be described by Freundlich model with the higher regression coefficient,besides the adsorption capacity was enhanced with the increase of temperature. The thermodynamic parameters of adsorption reaction,ΔG < 0,ΔH >0 and ΔS > 0,indicated that adsorption process was a spontaneously endothermic reaction. Besides the values of entropy increased during the whole adsorption process,which indicated that the degree of chaos was increasing during the adsorption.
引文
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